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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .A6P | Adobe Systems Incorporated | Executable Files | Authorware 6 Program | Adobe Authorware | Adobe Systems Incorporated |
| .AC | GNU Operating System | Executable Files | Autoconf Script | GNU Autoconf | GNU Operating System |
| .ACC | FKJ Software | Executable Files | Graphics Accounts Data File | Graphic Accounts | FKJ Software |
| .ACTION | Apple | Executable Files | Automator Action | Apple Automator | Apple |
| .AHK | Open Source | Executable Files | AutoHotkey Script | AutoHotkey | Open Source |
| .AIF | Apple | Executable Files | Audio Interchange File Format | Microsoft Windows Media Player | Microsoft Corporation |
| .AIR | Adobe Systems Incorporated | Executable Files | Adobe AIR Installation Package | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .APP | Nokia | Executable Files | Symbian OS Application | Symbian OS | Nokia |
| .ASB | Planit Solutions, Inc. | Executable Files | Alphacam Stone VB Macro File | Planit Alphacam | Planit Solutions, Inc. |
| .AZW2 | Amazon | Executable Files | Amazon Kindle Program | Amazon Kindle | Amazon |
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